## Math: finding a quadratic function from three points when you don’t know the vertex

The tutor shows an example to find the equation of a quadratic function from three points. The method is to construct and solve a three-variable linear system. Example: Find the quadratic function that passes through the points (2,17), (6,5), and …

## Math: solving a system of linear equations in 2 variables with the Sharp el-520w

The tutor shows how to easily solve a two-variable linear system with the amazing Sharp el-520w. Let’s imagine you’re posed the following problem: Solve the linear system: (2/3)x – (1/5)y = 2 -4x + 3y = 6 With the Sharp …

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## Calculator usage: Sharp EL-520W: multiplication in the denominator

The tutor shares a recent discovery. Imagine you want to calculate 8/2×4 The answer should be 1, of course: in a fraction, there are unwritten brackets around the numerator and around the denominator. Unless you have a calculator that accepts …

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## Calculator usage: the gravity constants on the Sharp EL-520W

The tutor tells another useful feature of the Sharp EL-520W: its built-in gravity constants. Maybe you’re in high school physics, so you’re doing calculations related to gravity. You might be using the Earthbound formula F=mg, or the universal one, F=Gm1m2/r2. …

## Calculator usage: finding the derivative with the Sharp EL-520W

The tutor shares how to find the derivative with the Sharp EL-520W. To my knowledge, the Sharp EL-520W won’t give the symbolic derivative. Rather (as you’d likely expect anyway), it evaluates a function’s derivative at the x value the user …

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## Formula use: Simulation calculation on the Sharp EL-520W

The tutor shows another feature of the Sharp EL-520W: simulation calculation, aka repetitive calculations with a formula. Let’s imagine you’re a middle school math teacher who wants to do a lesson about Pythagorean triples: you want sets of values a, …

## Calculator use: definite integrals on the Sharp EL-520W

The tutor shows the easy definite integral function on the Sharp EL-520W. While indefinite integrals such as ∫(xsinx)dx remain out of reach from calculators I know, the definite integral ∫0Π(xsinx)dx is easy to find on the Sharp EL-520W. You want …

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## Statistics: normal distribution calculations with the Sharp EL-520W

The tutor continues to find handy features on the Sharp EL-520W. Â Today: probability associated with the normal distribution. The Sharp EL-520W just keeps on giving. Â Sometimes I wonder, “Will it do that?” Usually, it turns out that it does. Relating …

## Calculator usage: The Sharp EL-520W Equation Solver

Tutoring math, I continue to discover new functions on calculators. Â The tutor gives a brief introduction to the Sharp EL-520W equation solver.   Let’s imagine you need to solve the equation 5×2 – x – 6 = 0 The roots …